Abstract: A televison signal transmission system comprising transmitting stations and receiving stations. Each transmitting station has a signal-transmitting circuit and a signal-superposing circuit. The signal-superposing circuit superposes a discriminant signal on a television signal during a vertical-blanking interval of the television signal. The discriminant signal is required for selecting the television signal. The signal-transmitting circuit inserts the television signals, containing the discriminant signal, into the communication channel assigned to the transmitting station, and then transmits the television signal to the receiving stations. Each receiving station has a signal-receiving circuit, a signal-detecting circuit, and a signal-selecting circuit. The signal-receiving circuit receives the television signals transmitted from the transmitting stations.